Dual-Motor Multi-Gear Hybrid Transmission for Variable Speed Ratios
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Solution Overview
Problem
Traditional hybrid vehicles are limited by fixed speed ratios, which prevent the engine from operating at its best economic point and restrict power transmission performance.
Innovation Solution
A dual-motor multi-gear hybrid transmission system is introduced, featuring a double clutch mechanism connecting two input shafts, a planet gear system, and a brake assembly, allowing for flexible speed ratio adjustment across different driving modes, enabling the engine to operate optimally and improving power transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed speed ratio is adopted in the hybrid system, then the structure is simple, but the engine cannot work at the best economic point and power transmission performance is limited
Solution Approach 1:
The patent applies the dynamics principle by transforming the fixed speed ratio transmission system into a multi-gear variable speed ratio system. The transmission system includes multiple gear sets (first gear set, second gear set, third gear set) that can be switched between different gear ratios according to driving conditions, enabling the engine to operate at optimal economic points while improving power transmission performance across different speed ranges.
2Device complexity
If a fixed speed ratio is adopted in the hybrid system, then the structure is simple, but the engine cannot work at the best economic point
Solution Approach 1:
The patent implements variable speed ratio transmission through multiple gear sets that can be dynamically switched. This allows the engine to operate at its best economic point (optimal fuel efficiency range) by matching the transmission ratio to the driving conditions, thereby improving energy utilization while maintaining relatively simple system structure through modular gear design.
3Productivity
If dual-motor multi-gear system is adopted, then power transmission performance is improved, but device complexity increases
Solution Approach 1:
The patent applies the nesting principle by arranging multiple gear sets (first gear set, second gear set, third gear set) in a nested or integrated configuration within a single transmission system. The first planet row and second planet row are coupled through shared components, allowing multiple gear ratios to be achieved within a compact structure, thus improving power transmission performance while controlling device complexity.
Solution Approach 2:
The transmission system is designed with multi-functionality, where the same gear sets and planetary mechanisms serve multiple purposes: achieving different gear ratios, enabling engine braking, supporting electric motor assistance, and providing direct drive modes. This universal design improves power transmission performance across various operating conditions without proportionally increasing device complexity.
Data Source
AI summary
Disclosed are a dual-motor multi-gear hybrid transmission system and a vehicle. The dual-motor multi-gear hybrid transmission system includes an engine, a first motor, a second motor, a first clutch, a second clutch, a first planet row, a second planet row, a first input shaft, a second input shaft, a third input shaft and a brake assembly. The first input shaft is connected to the engine through the first clutch. The second input shaft is connected to the engine through the second clutch, and the second input shaft is sleeved outside the first input shaft. The first motor is connected to the engine. The second motor is connected to the first planet row through the third input shaft. The brake assembly is configured to brake the first planet row and/or the second planet row.